The DNR repeater in Lincoln County has some activity in the Summer months. I've heard activity during the hunting seasons too but not as much. The repeater output is 159.750mhz and you'll hear the units call each other and identify as being "on Lincoln".
I've caught some GBI activity in the past on 151.205mhz in the McDuffie County area but it's been many years since I have. I know of at least five repeater pairs, they all use the same output of 151.205mhz, same PL tone but have different repeater inputs.